System and method for online property prediction for hot rlled coil in a hot strip mill

Abstract

A system for on-line property prediction for hot rolled coils in a hot strip mill of a steel plant, including a unit for capturing the chemistry from the steel making stage and providing the data on rolling schedule. Field devices are provided at the instrumentation level for measuring process parameters during hot rolling. A programmable logic controller is used for acquiring data of measured parameters from the field devices and feeding the data to a processor. Means is provided for conversion of the measured data from time domain to space domain using segment tracking. A computation module processes the converted space domain data for predicting mechanical properties along the length and through the thickness of the strip being rolled. A display unit displays the predicted properties. The data obtained can be stored in a data warehouse for future use. A unit provided in the system can collect the predicted properties and feed the same to the scheduling unit.

Description

FIELD OF INVENTION [0001] The present invention relates to a system and method for on-line property prediction for hot rolled coil in a hot strip mill. This invention is in the area encompassing automation research and development, applied to metallurgical processes with specific reference to mechanical property of hot rolled coil. BACKGROUND OF THE INVENTION [0002] In the hot strip mill the slabs are heated and soaked at an elevated temperature (˜1200° C.) in the reheat furnace, and are subjected to subsequent reduction in the roughing and finishing mill. All reductions are completed in the austenitic phase (˜890° C.) before the strip enters in the run-out table (ROT). The strips are cooled down to ˜600° C. by using laminar water jets on be ROT, before being coled in the down coiler. [0003] For determining the mechanical properties of a hot rolled coil from the hot strip mill, in accordance with the criteria mentioned in the technical delivery condition, the usual practice is to pe...

AI Technical Summary

Benefits of technology

[0010] The main object of the present invention therefore is to provide an on-line system and method of property prediction over the length of hot rolled coil, as the coil is being rolled, to improve the quality and to achieve the stringent property requirements. Such on-line prediction helps the operator to take corrective actions so as to get nearly uniform mechanical properties along the length of the strip.

Problems solved by technology

One drawback of this existing method is that there is only one sample per coil that can be tested since the coil cannot be cut from the module for taking the samples.

Because of the very nature of the cooling process for the coil, non-uniform cooling takes place along the length of the strip giving very different test results for the cut out from the end of the coil than that likely to be obtained form the body of the coil.

As the results can be obtained only after ⅔ days (time required for cooling from about 600° C. to room temperature), no corrective action can be taken during production of the hot rolled strip.

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